Two freedom linear parameter varying μ synthesis control for flight environment testbed

To solve the problem of robust servo performance of Flight Environment Testbed(FET)of Altitude Ground Test Facilities(AGTF) over the whole operational envelope, a two-degree-offreedom μ synthesis method based on Linear Parameter Varying(LPV) schematic is proposed, and meanwhile a new structure frame of μ synthesis control on two degrees of freedom with double integral and weighting functions is presented, which constitutes a core support part of the paper. Aimed at the problem of reference command's rapid change, one freedom feed forward is adopted, while another freedom output feedback is used to meet good servo tracking as well as disturbance and noise rejection; furthermore, to overcome the overshoot problem and acquire dynamic tuning,the integral is introduced in inner loop, and another integral controller is used in outer loop in order to guarantee steady errors; additionally, two performance weighting functions are designed to achieve robust specialty and control energy limit considering the uncertainties in system. As the schedule parameters change over large flight envelope, the stability of closed-loop LPV system is proved using Lyapunov inequalities. The simulation results show that the relative tracking errors of temperature and pressure are less than 0.5% with LPV μ synthesis controller. Meanwhile, compared with non-LPV μ synthesis controller in large uncertainty range, the proposed approach in this research can ensure robust servo performance of FET over the whole operational envelope.     

Plant mineral nutrition,gas exchange and photosynthesis in space: A review

Successful growth and development of higher plants in space rely on adequate availability and uptake of water and nutrients, and efficient energy distribution through photosynthesis and gas exchange. In the present review, literature has been reviewed to assemble the relevant knowledge within space plant research for future planetary missions. Focus has been on fractional gravity, space radiation, magnetic fields and ultimately a combined effect of these factors on gas exchange, photosynthesis and transport of water and solutes.     

飞院精神文化的竞争力

文化竞争力是高校核心竞争力，精神文化是大学文化的最高层次，其竞争力决定一所高校文化的整体竞争力。飞院精神文化具有良好的竞争力，表现为鲜活的生命力、强大的凝聚力、持久的驱动力、高度的奉献力和卓越的弓l领力。     

浅析针对高校教师队伍员工援助计划(EAP)的实施

着重探讨了员工援助计划(EAP)在我国高等院校中的实施情况。EAP的产生与工业大生产密切相关,在企业中的使用较为普遍。本文分析了EAP向高校扩散的路径,并通过对高校教师职业压力来源的分析提出了EAP在高校中的实施模式。     

高校班主任应是学生心理健康教育的指导教师

本文从全国各高校普遍存在的大学生心理健康的不良状况入手 ,分析了高校班主任工作的特点 ,论证了高校班主任工作的新角色应该是大学生心理健康教育的指导教师     

高校图书馆采访方式的整合及采访质量监控

高校图书馆的采访工作是保证馆藏图书质量的重要关口,通过对高校图书馆常用采访方式的分析,提出了现采与预定,网上采访,建立学科馆员采访制度的整合和互融,只有一切从实际出发,满足师生需求,同时,建立起质量评价监控体系,才是提高馆藏图书质量的有效方法。     

从清华校训谈孔子的中庸思想及其现代价值

孔子思想是一个以仁为本,以礼为制,以中为用的泛伦理体系,他一生对中庸思想推崇备至。从清华大学"自强不息厚德载物"的校训去进一步探究中庸思想的渊源,对其含义的正确理解,中庸思想在《论语》中的表现以及中庸思想在现今社会中所具有的现代意义具有深刻的意义等,都有着重要的研究价值。     

澳大利亚国立大学的办学优势和特色

对澳大利亚国立大学的办学优势做了概括性介绍,分析了它的特点,在校园建设、办学定位、杰出人才培养、设施经费、决策机制、师资力量等方面可为我国高校提供参考和借鉴。     

如何扮演好学生日常管理工作中的三个角色

大学生日常管理工作是一项十分具体和繁杂的长期性工作,辅导员是这项工作的主要实施者,是学生日常管理工作第一线的组织者和教育者,要特别扮演好学生的师长、兄长和朋友三种角色。     

高校二级民办学院的办学现状存在问题及对策

普通高校的国有民办二级学院是市场经济的产物 ,其发展促进了我国教育事业的发展。但是 ,在制度环境、生源、师资建设、公办学校的发展、境外教育机构的涌入等使民办教育发展面临挑战。针对这些问题 ,本文探讨了国有民办二级学院可持续发展的策略